I did not like this book at all. Jack Reilly is one of, if not the most, unlikable main characters I have ever come across. He is bitter about his family, his ex-wife, his job, and the changes within the city of Boston. In fact, he didn't seem to enjoy anything in his life.
I found the racial slurs highly disturbing. The main character and many of the other characters tossed crude remarks around as if their opinions were fact. They insulted various races, as well as gay people and "illegals" on a constant basis. The author portrayed Boston to be a city of intolerant, narrow-minded losers.
As for the plot, I grew up and spent most of my life in the suburbs of Boston, so I understood the references to the various parts of the city. I'm not sure these things would translate well to readers unfamiliar with the area. There are many characters and a lot of activity going on, making the plotlines difficult to follow. The entire government of Boston, all officials and the police departments, are corrupt. No one can be trusted because they are all owned by mobsters and/or hungry for power. The extent of the corruption vastly stretched believability for me.
The only good thing I can say about this book is that the writing itself, style and sentence structure, is very good. The dialogue is crisp and you get a strong sense of each character's personality. But I didn't like any of them.